The images in that post use full URLS:
http://www.webassist.com/images/star_cutout.gif
you can download the images using those URLS.
The script creates a hidden form element that contains the selected rating value, you can use that hidden element binding in Data Assist insert record or update record behaviors to save the rating.
if you need help implementing this, we can help through ah premiere support appointment:
http://www.webassist.com/premier_request.php